$ git clone -n https://src.fedoraproject.org/rpms/python-firehose.git /var/lib/mock/f45-build-30717-647/root/chroot_tmpdir/scmroot/python-firehose
Cloning into '/var/lib/mock/f45-build-30717-647/root/chroot_tmpdir/scmroot/python-firehose'...
$ git fetch origin cb5525fac79fcaab8f8dfc82e2938037bd639188:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-firehose
 * [new ref]         cb5525fac79fcaab8f8dfc82e2938037bd639188 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb5525f Rebuilt for libxml-2.5.4